Electric transmitter.



No. 805,092. PATBNTED NOVZI, 1905.

- J. PRINCE.

ELECTRIC TRANSMITTER.

APPLICATION FILED PBB.2, 1905.

UNITED STATES PATENT OFFICE.

JEROME PRINCE, OF MILFORD, MASSACHUSETTS, ASSIGNOR OF PARTS TO CHARLES E. ALDRICH AND JOHN H. MACDONALD, OF BEVERLY, MAS- SACHUSETTS.

Specification of Letters Patent.

ELECTRIC TRANSMITTER.

Patented Nov. 21, 1905.

Application filed February 2, 1905. Serial No. 243,833-

To @ZZ whom it may concern:

Be it known that I, JEROME PRINCE, a citizen of the United States, and a resident of Milford, in the county of Worcester and State of Massachusetts, have invented certain new and useful Improvements in Electric Transmitters, of which the following is a specification.

This invention relates to improvements in telephone-'transmitters for telephones, earphones, and other similar purposes; and it consists of the construction and arrangement of parts as will hereinafter be more fully shown and described, reference being had to the accompanying drawings, where Figure 1 is a top plan view of the invention, and Fig. 2 is a cross-section ou .the line 2 2 shown in Fig. 1.

Similar letters refer to similar parts wherever they occur on the different parts of the drawings.

The box is composed of 'a shell or ring A, to the upper end of which is fitted the open front or mouth piece A. To the under side of the shellA is fitted the cover A, as shown. The said box is made of metal, but may be made of hard rubber or other suitable material, if so desired.

B is the vibratory diaphragm, preferably made of aluminium, but may be made of any other suitable* material. The periphery of said diaphragm is held in contact with the front Al in any suitable manner. On the inside of said diaphragm B is centrally located a iiexible disk C, which may be made of guncotton or other suitable flexible material, for a purpose as will hereinafter be stated. On the lower part of said exible disk is located first a copper disk D, to which is connected a Zinc disk E, and to the latter is connected a carbon plate F, as shown in Fig. 2, said parts F, E, D, and C being attached to the diaphragm B by means of a screw-threaded pin Gr and nut g, as shown in the drawings.

On the interior of the box is located a carbon cup H, containing a carbon disk I, and below the latter a Zinc disk K and copper disk L, to which is secured a screw-threaded spindle M, passing through a perforation in the cup H.

Below the carbon cup H is placed a copper disk N, below which is arranged an insulating-sheet O, which may be made of leather, board, or other suitable non-conducting material, interposed between the under side of copper disk N and a perforated hard-rubber ring or washer Q, located ina central recess in the cover A". The cup H lis secured in threaded spindle Mand ametal nutm, screwed thereon, which nut is insulated from the cover A by means of conical bearing-sleeve R, interposed between nut m and the central perforation in the cover A".

The transmitter is adapted to be connected in a telephone-circuit by means of wires S T in metallic connection, respectively, Vwith the diaphragm B and copper plate K, as shown in Fig. 2.

The carbon cup H contains va granulated mass U, preferably composed of granulated copper, Zinc, and magnetic ore, acting as a greater vibratory force for conducting the current. The flexible sheet or washer C serves as a cover around the upper edge of the carbon cup H for the purpose of preventing the granules U from dropping out of said cup.

The device is very simple, composed of very few parts, and provides an excellent and eiiicient transmitter of increased power when connected in a telephone-circuit either in ordinary telephone or in devices such as are termed ear-phones, adapted to be carried by persons afflicted with hard hearing or partial deafness.

What I desire to secure by Letters Patent and claim is#- 1. The herein-described telephone-transmitter including a casing having a vibratory diaphragm, aiiexible disk having copper, zinc and carbon plates cooperative therewith and secured to the diaphragm, a carbon cup having carbon, zinc and copper plates, connected to the interior of said case and arranged opposite said flexible disk, granules interposed between the plates in the respective disk and cup, and circuit-wires connected to the electrode of the transmitter.

2. The herein-described telephone-transl mitter including a casing having a vibratory place within the box by means of the screw- IOO lbon cup oppositely disposed to said flexible diaphragm, a flexible disk secured thereto and cuit-wires metallically connected to the elechavingr copper, Zinc and carbon plates, a cartrodes of the transmitter. IO

In testimony whereof I have alXed my sigdsk, carbon, zinc and copper plates within nature in presence of two witnesses. said carbon cup, means for securing the cup to the said case,v granules of copper, zinc and magnetic ore interposed between the said plates in the respective disk and cup, and cir JEROME PRIN CE.l WTitnesses:

ALBAN ANDRN, THEKLA ANDRN. 

